| 摘要 |
PURPOSE:To eliminate adders to obtain a simpler constitution by providing a means which applies a unidirectional voltage, which is obtained by rectifying and power-amplifying a variation of a recording speed after differential function amplification, to one end of a thermal pen and applies a voltage corresponding to a variation of time feed of a thermosensitive recording paper or a unidirectional voltage corresponding to the input of an analog signal different from this input to the other end of the thermal pen as a negative-direction voltage. CONSTITUTION:The output of a servo amplifier 1 is applied to a servomotor 2, and the thermal pen is moved to describe a quantity to be measured on a thermosensitive recording paper 11. Its variation is detected as an extent of movement of a DC voltage from a part of the servo amplifier 1 and is converted to a speed quantity by a differential function amplifier including an amplifier 3. Since the differentiated output is detected as a potential in positive and negative directions, it is rectified to a unidirectional potential by a rectifier 4 and is supplied to one end of a thermal pen 12 by a power amplifier 5. With respect to time feed of the thermosensitive paper, the speed is detected by a frequency-voltage converter. This voltage is detected with a reverse voltage of the deflection speed quantity of the thermal pen and is supplied to the other end of the thermal pen 12 by a power amplifier 10. |
